Good stuffBy Dioncudaon 12/8/2013

Good Product!By Jakeon 12/7/2013

Good product! tumbles well, not much dust at all, and does what i want it to do!

Excellent productBy Mrehfeldon 11/23/2013

Mrehfeld would recommend this product to a friend

This product is excellent and does what it's meant to do! See my other review on the GFO reactor.

Great productBy Rayon 11/5/2013

Ray would recommend this product to a friend

Great product for a great price.

DON'T OVERDOSEBy Danielon 10/31/2013

Daniel would recommend this product to a friend

Works great if dosed responsibly, BRS has a great calculator. I accidentally used too much and it turned my tank very cloudy.

Good productBy A.R.on 10/19/2013

A.R. would recommend this product to a friend

Great customer service and fast shipping. As the product itself is good but very slow process. Overall good product and addition to the reef environment if you are having algae problems.

A fair deal on a reef maintenance stapleBy raysunon 10/14/2013

raysun would recommend this product to a friend

At $22.00 for a pound, it's hard to argue the price for standard capacity GFO. It comes packed dry and pretty much dust free so media changes are easy. Little if any residue rinses out when first loaded into a media reactor or filter bag. (Contrast RowaPhos, for example, a fine product too, but it seems to emulate the Mississippi river for brown flow when first rinsed.)

To maintain my LPS tanks at their current low phosphate levels, this does the trick. When levels rise to 0.05 ppm, I change the media. Within hours phosphate levels drop to undetectable.

If I had a big phosphate problem, I'd consider springing for the High-Capacity (and high-cost) GFO to get more phosphate removal between changes. Large bio-loads, heavy feeding, or new rock that leaches phosphate might weigh into that decision.

At a recommended usage rate of 1 tablespoon per 4 gallons of aquarium water, large aquariums would use a fairly large dose of this stuff. 100 gallon tank would use just shy of 1 1/4 cups per media change - a bit more than 12 media changes for a gallon of GFO. Really large setups will probably benefit from using the HC GFO.

Best valueBy Dennison 10/5/2013

Dennis would recommend this product to a friend

A great value for use in reducing phosphate levels. Water quality has steadily improved in multiple large reef tanks with heavy fish loads. Corals love it.

Good product. Not great. expires quickly if you have a phosphate issue.1 week tops until a change out is due if you already have GHA. This product may work great for a low nutrient established tank with a fuge, killer skimmer, and methodical husbandry. I don't own a killer skimmer, (its stock on my 25 gallon Ecoxotic cube), nor do I utilize a refugium. My husbandry is anal-retentive. Therefore I rate this product a 3 out of 5. I am now changing it out weekly until it runs out. Afterwards I will stick with Rowaphos or try BRS high capacity. Either way, I will report back with informative comments. I will always buy from BRS because of their products, website design, and most importantly their relative and educational videos.

Best PriceBy Marioon 10/3/2013

Mario would recommend this product to a friend

Honestly by far the best GFO I've used, you get the most for you money and then some! Happy customer!

Great product By Dylanon 9/24/2013

Dylan would recommend this product to a friend

Most cost effective phosphate solution works great in my BRS Dual Reactor

Another Great BRS ProductBy Deadpoolon 9/20/2013

Deadpool would recommend this product to a friend

I have to say this product along with many other BRS products have really out done themselves. Everything is dedicated to the Reef Aquarium Hobbyist. This product does not fall short of BRS standards.

Great product at a good priceBy Markon 9/17/2013

Mark would recommend this product to a friend

Great product at a good price, the only GFO I use

GreatBy Johnon 9/13/2013

John would recommend this product to a friend

Great gfo, Does what it is said to do, Change mine ourt of the BRS dual reactor once a month and works great on controlling algae. One of the first smart buys when setting up Your tank !

Great productBy Royon 8/23/2013

Roy would recommend this product to a friend

I use this on my ulns 90 gallon aquarium in a BRS dual reactor and it works well for me. I also run bio pellets and I use this product to help keep my phosphates low when my pellets can't. I have a valve on my reactor so I can fine tune how much PO4 the GFO is removing.

Does what it saysBy Heifinatoron 8/19/2013

Heifinator would recommend this product to a friend

Removes phosphates well, simple as that.

works greatBy Brianon 8/15/2013

Brian would recommend this product to a friend

Works great, saw a difference the next day. Does have a lot of dust in it though but the price is right.

Great Value Geat ProductBy mltnguyenon 8/8/2013

mltnguyen would recommend this product to a friend

This product came well packed and had very little dust. A++ BRS

GoodBy Yunieron 8/6/2013

Yunier would recommend this product to a friend

This will lower your phosphate and great price for quality items.

Excellent ProductBy Tankjunkieon 7/30/2013

Tankjunkie would recommend this product to a friend

I've been using GFO from BRS for awhile and have no complaints. Keeps phosphates in check very effectively. I always recommend GFO to anyone having phosphate issues.

Use it on all my tanksBy Williamon 7/22/2013

William would recommend this product to a friend

I absolutely can't do without the BRS bulk GFO. It drastically improved the water quality of all of my aquariums. A 180gal reef tank and a 110gal fish only. Phosphate levels are almost not existent now after using the GFO, especially in the dual GFO and carbon media reactor.

great productBy Bobon 7/11/2013

Bob would recommend this product to a friend

this has cured my algae problems before. I now dont run a saltwater tank without it.

I'm Sold!By Ericon 7/5/2013

Eric would recommend this product to a friend

This stuff is the most cost effective phosphate solution I have found. Could not be happier with the product.

Cant do without it.By Randyon 7/1/2013

Randy would recommend this product to a friend

Everytime I run out of this thing and think I am doing well, I have to run and get some more. Awesome product

Worth the money!By Johnon 6/28/2013

John would recommend this product to a friend

Easy to use, have used different brands of GFO in the past. After adding BRS GFO, algae problems have reduced to nothing!

gfo quailityBy hunteron 6/25/2013

hunter would recommend this product to a friend

Ordered up some of this gfo.. Samre as the carbon seems to be doing a good job so far. Also did not notice much waste when rinsing it off.. huge deal for me when your looking at gfo prices..

GREAT PRODUCT AT A GREAT PRICE!!!By Dolmo5000on 6/25/2013

Dolmo5000 would recommend this product to a friend

BRS does it again! I have looked far and wide for GFO at a cheaper price. Although there are a very few places advertising it for a cheaper price reviews of the product say it contains lots and lots of dust. I believe that BRS sells a fantastic product and will purchase GFO and all other bulk additive from them as long as I'm in the hobby (rest of my life). GREAT JOB BRS!!!

now winning the battleBy algae victoryon 6/13/2013

algae victory would recommend this product to a friend

Had a pretty good algae bloom in reef tank 1yo. Never used GFO decided to give it a try in my sump sock. Day two seeing significant results oh and new sock was green after day one.

Instructions on package were confusingBy Charleson 6/12/2013

Charles would recommend this product to a friend

I got this from a friend that had taken down his tank. I am overall satisfied with the product itself, but the instructions were confusing and I believe i used way too much after the initial period. I got some clarity on it with the calculator. My pump went up on me for a couple days and i started noticing algae growth almost instantly. Got a new pump and did a water change and the GFO did the rest.

Good quality GFOBy Billon 6/7/2013

Bill would recommend this product to a friend

This GFO works well and is very cost efficient way of removing PO4 in any aquarium. No problems does exactly what it is supposed to do.
I do find that it has more fines to be rinsed than some higher quality GFO (RowaPhos).

effective and good priceBy Mikeon 6/2/2013

Used regularly it has transformed my reef from an algae jungle to a coral jungle!

GFO WorksBy ACon 5/15/2013

AC would recommend this product to a friend

With the use of the BRS GFO I have removed just about all my algae problems in my tank.

SOLID PURCHASE!!!By Dolmo5000on 5/6/2013

Dolmo5000 would recommend this product to a friend

Although I find the need to flush BRS gfo more than others I have used in the past, the cost difference more than makes up. Another solid product out of the BRS team!

Not sure yetBy Michaelon 4/29/2013

Michael would recommend this product to a friend

Have been using for about 3 weeks so far with no change in my phosphate level. Doing water changes also. Need more time to evaluate not sure about recommending yet. Phos Ban maybe better.

Great Stuff!By Edwardon 4/26/2013

Edward would recommend this product to a friend

Made the mistake of trying a different brand after using BR GFO; I'm back!

it really does work people so buy it! By dimitrion 4/18/2013

dimitri would recommend this product to a friend

i am running my gfo thought the BRS Dual Reactor its amazing and completely worth it buy it you will not regret it. fixed my tank and all the algae problems it had.

will always use By Pongoon 4/17/2013

Pongo would recommend this product to a friend

Having started with SW in the dark ages and then coming back to it alot has changed and gfo is certainly a great product. I had been battling dino's for a few weeks. Within 24 hrs of starting with gfo I noticed a immediate reduction in dinos to almost complete elimination in less than a week.

Great product at a Great Price By Bparetion 4/15/2013

Bpareti would recommend this product to a friend

Summary says it all.
could not ask for more.

GFO works best for phosphate removalBy Vincenton 4/14/2013

Vincent would recommend this product to a friend

I run the GFO in A BRS dual Reactor with carbon. Never have any phosphate issues.

Great ProductBy Johnon 4/13/2013

John would recommend this product to a friend

Brs gfo is the best value of all gfo. It pulls the phosphate out and keeps it down

Great product but attention to detain in packaging the product is lackingBy Glennon 4/11/2013

Glenn would recommend this product to a friend

Great product. My first purchase of this product was exceptional in all ways, but my recent purchase was less than desireable. The 5 gallon container had GFO all over the outside of the plastic bucket and in the bottom of the shipping box.
Attention to detain was lacking!

GFOBy DAVEon 4/11/2013

DAVE would recommend this product to a friend

Best price for any gfo. You will not regret this purchase

Beat price GFO aroundBy Shawnon 4/11/2013

Shawn would recommend this product to a friend

I was at a big box store the other day and saw less than 6oz of GFO for about 40 bucks here you can get 2lbs of a great product for same price. my phosphates stay low keeps allege in check and corals growing.

Great ProductBy Travison 4/8/2013

Travis would recommend this product to a friend

This works really well. My phosphates continue to stay really low.

works greatBy Andy Con 4/8/2013

Andy C would recommend this product to a friend

I'm running 1.5 cups in the dual reactor for 200 gallons, which is half of what the BRS calculator recommends. The reactor can't handle much more per cartridge and still keep things flowing. I change it every two weeks, rather than use 3 cups and change monthly. So far so good with this system.

Eventually I want to get a separate reactor for carbon and then just run 1.5 cups in each side of the dual reactor, but the system is working so far for me.

great stuffBy royon 4/6/2013

roy would recommend this product to a friend

Best price for gfo. You will not regret this purchase as your corals will thank you and so will your wallet

Good gfo for the costBy garrisonon 4/5/2013

garrison would recommend this product to a friend

I used this in a filter sock and reactor, i recommend the reactor. Anyway, this stuff is great, it eats right through phosphates. No more algae!